Improvement in apparatus for cutting the casings or tubes op oil-wells



ma swag @tutti @Wine PERLEY H.. LAWRENCE, OF APETROLEUM CENTRE, PENNSYLVANIA.

Letters Patent No. 105,156, dated July 5, 1870.

IMPROVEMENT IN APPARATUS'IE-AOR CUTTING- THE CASINGS OR. TUBES OF OIL-WELLS.

The Schedulezfeferre t'in. these Letters Patent and making part of the same.

To all whom kit may concern:

Be it known that I, PERLEY H. LAWRENCE, of Petroleum Centre, in the county of Venango and State Y'of Pennsylvania, have invented certain new and 'useful Improvements in a asing-Cutter, or an Apparatus for Relieving the Tubing in Oil-Wells; and the following is afull, clear, and exact description of thee same, reference being had to the accompanying drawing making a part ot' this specification, in which- Figure 1 represents an exterior View of -the apparatus, showing the cutting-tool or spur protruding through the surface.

Figure 2 shows alougitudinal sectional view through the same at the line w w. 2

Figure 3 shows a cross-sectional view through at the line x x.

' Figure 4 is an end or crosssectional view atl th line y y.

Figure 5 vrepresents the interior plug, l with an inclined groove, to operate the cutting-tool or spur and the connecting-rod.

Figure 6 shows the lower end view of the plug or sliding wedge.

Theobject of Ilny inveutionvis to cut the casing or tubing in oil-wells, so as to relieve them from the seedbag water-packers, or other obstructions; and

It consists of a revolving head or tool-holder, provided with one or more cutting-tools or spurs, so tted in the stock or head that it or they may be forced ont by the action of an inclined groove, made longitudinally in a plug fitted to slide np or down in the stock.

The plug being connected with and is operated by a small pipe or rod from the top, it being put down in the casing to the point desired to be cut.

'lo enable others to make and use my invention I will describe it more in detail, referring to the drawing and to the letters'of reference marked thereon.

The head or stock A may be made of cast metal of any required size, thecentral portion being bored out smooth, to admit of the plug B being fitted' to slide freely up or down'.

A piece of pipe, G, having a shoulder, c, is screwed into the stock A, to forni a stop for the slide B at the bottom.

In. the central portion of the stock A are fitted one, or more spurs or cuttingt ools, a, which slide in and out, and are operated by a wedge-.shaped groove, 1),. in the slide B.

At various points opposite or in aline with the cutter a, are placed friction-rollers or studs, e e, to hold the stock centrally in the tube or casing while it is being cut.

To the upper end of the toolfstock A is screwed in: tubing D, to extend upto the top of the well, by which the apparatus is rotated.'

Through the tube D is a small tube or rod, E, connected with the sliding plug B, by which means the cutter a is'forced out as it progresses in cutting the casing in the weil.

The operation is as follows:y

When it is desirous to remove the easing of an oilwell, the cutting apparatus is put down tothe required depth inside the casing, and heldin position by a dog .or clamp securedV to the tube D, vand resting on the top of the well. Then put down the small pipe or rod E, and connect with the slide B. Then,by raising the slide, while turning the tube D, the casing is soon cut, so as to relieve them from the seed-bag water packer or'- other obstructions.

What I claim as my invention, and desire to secure byl Letters Patent, is-f i i 'Ibe improveddevice herein described, consisting of lthe stock A and cutter a, the plug B, with its inclined groove b, the pipe C, and shoulder c, forming a step tor theslidiug plug B, the upper `tubing D, and the connecting-tube or rod E, to extend to the top of the well, all constructed and arranged to operate substantially as set forth.

In testimony whereof I hereunto subscribe my name in the presence of- PERLEY H. LAWRENCE.Y

Witnesses SAM. REYNOLDS,

W. H. LONGWELL. 

